The invention relates to a technology for co-composting of blue-
green algae and polluted bottom
sediment, and belongs to the technical field of
environmental engineering. The technology comprises the following steps: at first, heavy
metal in the polluted bottom
sediment is removed by adopting a
bioleaching technology, then blue-
green algae and the polluted bottom
sediment are mixed, the physicochemical property of the mixture of the blue-
green algae and the bottom sediment is regulated to the condition needed by growth of aerobic
fermentation microorganisms through adopting conditioners such as straws, rice husks,
bran, spent
mushroom composts, dregs of decoctions, wood chips and the like by means of the characteristics of
high water content of the blue-green
algae and C / N ratio imbalance and the like, a certain quantity of
nitrogen conserving agents is added, and then a forced ventilation
fermentation manner is adopted in a
compost factory, the temperature of the
compost is increased to be more than 60 DEG C within an extremely short time, the high-temperature
fermentation period is kept for about 15 days, and the
compost is transferred in a secondary fermentation zone till the compost is decomposed thoroughly after the high-temperature fermentation period is ended. The technology achieves the cleanness of the polluted bottom sediment and large-scale treatment of the quick composting of blue-green
algae and the polluted bottom sediment, and combines the harmlessness and the reclamation of the
algae and the polluted bottom sediment organically.